Lol - what are you putting in the mr2 - microwave, fridge, hairdryer... Sorry but I could image me trying it..
What motor is it for? a 2gr with electric power steering?
Seriously though, Toyota specs of alternators are good.
Can I asked how you worked out you need the alternator? What you are running in your car and battery to match?
Alternator talk can get confusing in the amp it makes at idle to peak as well.